Biomechanical analysis of a continuous passive motion device for the knee

Continuous passive movement device after surgery is used to relieve pain, increase general blood circulation in the limbs, reduce edema, improve synovial cartilage joints, delay muscle atrophy, reduce dryness and prevent shortening and adhesions. The system performs linear and controlled motion by a computer connected to the control board of the device with online calculations. An electric motor is connected to the main axis of the system, which controls the movement of the patient's foot. The affected joint moves through a designated arch, guaranteed for a long time. The motor speed control sensor is connected to the motor shaft and the amount of joint movement angle is measured by the sensor. Through feedback and impedance control and motor driver control, linear motion such as damped spring is done slowly. The movements are performed by controlling the amplitude and direction of the force and the pedal of the patient. The pc is connected to the computer to receive the analyzed data through a software system that is sent to the system processor. The computer system also allows extensive data recording, data analysis, and remote monitoring of the patient connected to the network. In this paper, the control angles of a continuous passive motion device are analyzed through mathematical equations and the design method for the knee joint is examined.